// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab

#include "librbd/io/ImageDispatchSpec.h"
#include "librbd/ImageCtx.h"
#include "librbd/io/AioCompletion.h"
#include "librbd/io/ImageRequest.h"
#include "librbd/io/ImageDispatcherInterface.h"
#include <boost/variant.hpp>

namespace librbd
{
    namespace io
    {

        void ImageDispatchSpec::C_Dispatcher::complete(int r)
        {
            switch (image_dispatch_spec->dispatch_result)
            {
            case DISPATCH_RESULT_RESTART:
                ceph_assert(image_dispatch_spec->dispatch_layer != 0);
                image_dispatch_spec->dispatch_layer = static_cast<ImageDispatchLayer>(
                    image_dispatch_spec->dispatch_layer - 1);
                [[fallthrough]];
            case DISPATCH_RESULT_CONTINUE:
                if (r < 0)
                {
                    // bubble dispatch failure through AioCompletion
                    image_dispatch_spec->dispatch_result = DISPATCH_RESULT_COMPLETE;
                    image_dispatch_spec->fail(r);
                    return;
                }

                image_dispatch_spec->send();
                break;
            case DISPATCH_RESULT_COMPLETE:
                finish(r);
                break;
            case DISPATCH_RESULT_INVALID:
                ceph_abort();
                break;
            }
        }

        void ImageDispatchSpec::C_Dispatcher::finish(int r)
        {
            delete image_dispatch_spec;
        }

        void ImageDispatchSpec::send()
        {
            image_dispatcher->send(this);
        }

        void ImageDispatchSpec::fail(int r)
        {
            dispatch_result = DISPATCH_RESULT_COMPLETE;
            aio_comp->fail(r);
        }

    } // namespace io
} // namespace librbd
